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When it comes to a blueprint for beauty, Nicky Hilton doesn't have to look far. The heiress tells PEOPLE, "My mom has the most flawless, amazing skin." So there was no question where she'd turn for skincare secrets: "She's been using age-preventative creams since she was like 19 – so I started at 20. You're never too young to start." One of Nicky's – and mom Kathy's – fave brands? "Estée Lauder, because they know their stuff."